ZKJ Autobio Copy
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Mammals from the Mesozoic of Mongolia
Mammals from the Mesozoic of Mongolia Introduction and Simpson (1926) dcscrihed these as placental (eutherian) insectivores. 'l'he deltathcroids originally Mongolia produces one of the world's most extraordi- included with the insectivores, more recently have narily preserved assemblages of hlesozoic ma~nmals. t)een assigned to the Metatheria (Kielan-Jaworowska Unlike fossils at most Mesozoic sites, Inany of these and Nesov, 1990). For ahout 40 years these were the remains are skulls, and in some cases these are asso- only Mesozoic ~nanimalsknown from Mongolia. ciated with postcranial skeletons. Ry contrast, 'I'he next discoveries in Mongolia were made by the Mesozoic mammals at well-known sites in North Polish-Mongolian Palaeontological Expeditions America and other continents have produced less (1963-1971) initially led by Naydin Dovchin, then by complete material, usually incomplete jaws with den- Rinchen Barsbold on the Mongolian side, and Zofia titions, or isolated teeth. In addition to the rich Kielan-Jaworowska on the Polish side, Kazi~nierz samples of skulls and skeletons representing Late Koualski led the expedition in 1964. Late Cretaceous Cretaceous mam~nals,certain localities in Mongolia ma~nmalswere collected in three Gohi Desert regions: are also known for less well preserved, but important, Bayan Zag (Djadokhta Formation), Nenlegt and remains of Early Cretaceous mammals. The mammals Khulsan in the Nemegt Valley (Baruungoyot from hoth Early and Late Cretaceous intervals have Formation), and llcrmiin 'ISav, south-\vest of the increased our understanding of diversification and Neniegt Valley, in the Red beds of Hermiin 'rsav, morphologic variation in archaic mammals. which have heen regarded as a stratigraphic ecluivalent Potentially this new information has hearing on the of the Baruungoyot Formation (Gradzinslti r't crl., phylogenetic relationships among major branches of 1977). -
AMERICAN MUSEUM NOVITATES Published by Number 330 Thz Auerican Museum of NAITURAL HISTORY October 30, 1928 New York City
AMERICAN MUSEUM NOVITATES Published by Number 330 THz AuERicAN MusEUM oF NAITURAL HISTORY October 30, 1928 New York City 56.9,33 (117:51.7) AFFINITIES OF THE MONGOLIAN CRETACEOUS INSECTIVORES' BY GEORGE GAYLORD SIMPSON The unique series of Mesozoic mammal remains found by the Third Asiatic Expedition in Mongolia has now been completely de- scribed in a series of three papers.2 The affinities of the one known multituberculate, Djadochtatherium matthewi, were as thoroughly discussed as the material warrants in the first paper, and no additional remarks seem necessary. The relationships of the more important insectivores, however, were only briefly discussed in the second paper and a review of the evidence, especially including the important new details given in the third paper, suggests some modification and amplification of the views already presented. Not only are these mammal remains by far the most complete ever discovered in the Mesozoic, but they also occupy a very strategic position in time and in space which makes close scrutiny of their relationships essential. In time they occur in the Cretaceous, when, according to theories formed before their discovery and based largely on early Tertiary mammals, the differentiation of the placental orders should be in progress and not yet far advanced. In space they occur in Central Asia in or near the region which a number of students, especially Osborn and Matthew, have considered as an important center of radiation and probably the very one whence came the groups of mammals which appear to have entered North America and Europe suddenly at the beginning of the Tertiary and which must have been undergoing an important deployment during upper Cretaceous time. -
SUPPLEMENTARY INFORMATION: Tables, Figures and References
Samuels, Regnault & Hutchinson, PeerJ Evolution of the patellar sesamoid bone in mammals SUPPLEMENTARY INFORMATION: Tables, Figures and References Supplementary Table S1: Mammaliaform patellar status$ Inclusive clades Genus and Stratigraphic age of Patellar Comments# (partial) species (and taxon, and location(s) state reference(s) used for 0/1/2 patellar status) (absent/ ‘patelloid’/ present) Sinoconodonta Sinoconodon Jurassic, China 0 Patellar groove absent, suggests no rigneyi (Kielan- patella Jaworowska et al., 2004) Sinoconodon is included on our phylogeny within tritylodontids. Morganucodonta Megazostrodon Late Triassic, southern 0 rudnerae (Jenkins Africa & Parrington, 1976) Morganucodonta Eozostrodon sp. Late Triassic, Wales 0 Asymmetric patellar groove, (Jenkins et al., specimens disarticulated so it is hard 1976) to assess the patella but appears absent Docodonta Castorocauda 164 Mya, mid-Jurassic, 0 Semi-aquatic adaptations lutrasimilis (Ji et China al., 2006) Docodonta Agilodocodon 164 Mya, mid-Jurassic, 0 scansorius (Meng China et al., 2015) Docodonta Docofossor 160 Mya, China 0 brachydactylus (Luo et al., 2015b) Docodonta Haldanodon 150-155 Mya, Late 0 Shallow patellar groove exspectatus Jurassic, Portugal (Martin, 2005b) Australosphenida Asfaltomylos Mid-Jurassic, South ? Postcranial material absent patagonicus America (Martin, 2005a) Australosphenida Ornithorhynchus Extant 2 Platypus, genome sequenced Monotremata anatinus (Warren, Hillier, Marshall Graves et (Herzmark, 1938; al., 2008) Rowe, 1988) Australosphenida Tachyglossus -
New Data on the Skull and Dentition in the Mongolian Late Cretaceous Eutherian Mammal Zalambdalestes
NEW DATA ON THE SKULL AND DENTITION IN THE MONGOLIAN LATE CRETACEOUS EUTHERIAN MAMMAL ZALAMBDALESTES JOHN R. WIBLE Section of Mammals, Carnegie Museum of Natural History, 5800 Baum Boulevard, Pittsburgh, PA 15206 e-mail: [email protected] MICHAEL J. NOVACEK Division of Paleontology, American Museum of Natural History e-mail: [email protected] GUILLERMO W. ROUGIER Department of Anatomical Sciences and Neurobiology, School of Medicine, University of Louisville, Louisville, KY 40292 e-mail: [email protected] BULLETIN OF THE AMERICAN MUSEUM OF NATURAL HISTORY CENTRAL PARK WEST AT 79TH STREET, NEW YORK, NY 10024 Number 281, 144 pp., 58 ®gures, 3 tables Issued January 9, 2004 Copyright q American Museum of Natural History 2004 ISSN 0003-0090 2 BULLETIN AMERICAN MUSEUM OF NATURAL HISTORY NO. 281 CONTENTS Abstract ....................................................................... 3 Introduction .................................................................... 3 Materials and Methods .......................................................... 5 History of Investigations ......................................................... 7 Comparative Morphology ....................................................... 17 Dentition ................................................................... 17 Upper Incisors ............................................................ 18 Upper Canine ............................................................. 21 Upper Premolars .......................................................... 22 Upper -
Mammal Disparity Decreases During the Cretaceous Angiosperm Radiation
Mammal disparity decreases during the Cretaceous angiosperm radiation David M. Grossnickle1 and P. David Polly2 1Department of Geological Sciences, and 2Departments of Geological Sciences, Biology, and Anthropology, rspb.royalsocietypublishing.org Indiana University, Bloomington, IN 47405, USA Fossil discoveries over the past 30 years have radically transformed tra- ditional views of Mesozoic mammal evolution. In addition, recent research provides a more detailed account of the Cretaceous diversification of flower- Research ing plants. Here, we examine patterns of morphological disparity and functional morphology associated with diet in early mammals. Two ana- Cite this article: Grossnickle DM, Polly PD. lyses were performed: (i) an examination of diversity based on functional 2013 Mammal disparity decreases during dental type rather than higher-level taxonomy, and (ii) a morphometric analysis of jaws, which made use of modern analogues, to assess changes the Cretaceous angiosperm radiation. Proc R in mammalian morphological and dietary disparity. Results demonstrate a Soc B 280: 20132110. decline in diversity of molar types during the mid-Cretaceous as abundances http://dx.doi.org/10.1098/rspb.2013.2110 of triconodonts, symmetrodonts, docodonts and eupantotherians dimin- ished. Multituberculates experience a turnover in functional molar types during the mid-Cretaceous and a shift towards plant-dominated diets during the late Late Cretaceous. Although therians undergo a taxonomic Received: 13 August 2013 expansion coinciding with the angiosperm radiation, they display small Accepted: 12 September 2013 body sizes and a low level of morphological disparity, suggesting an evol- utionary shift favouring small insectivores. It is concluded that during the mid-Cretaceous, the period of rapid angiosperm radiation, mammals experi- enced both a decrease in morphological disparity and a functional shift in dietary morphology that were probably related to changing ecosystems. -
A Survey of Cretaceous Tribosphenic Mammals from Middle Asia (Uzbekistan, Kazakhstan and Tajikistan), of Their Geological Setting, Age and Faunal Environment
A SURVEY OF CRETACEOUS TRIBOSPHENIC MAMMALS FROM MIDDLE ASIA (UZBEKISTAN, KAZAKHSTAN AND TAJIKISTAN), OF THEIR GEOLOGICAL SETTING, AGE AND FAUNAL ENVIRONMENT by Lev A. NESSOV *, Denise SIGOGNEAU-RUSSELL ** & Donald E. RUSSELL ** CONTENTS Page Abstract, Resume . 52 Introduction ..................................................................... 52 Middle Asian mammalian taxa created before the end of 1992 ............................. 54 Formations and determination of their age ............................................. 71 Fossiliferous contents of the mentioned localities . 75 General considerations . 82 Appendix ....................................................................... 84 Acknowledgments .. 84 Bibliography .................................................................... 84 Legends of plates .. 89 * Institute of the Earth's Crust, Saint Petersburg University, 199034 Saint Petersburg, Russia. ** Institut de Paleontologie, Museum national d'Histoire naturelle, 8 rue Buffon, 75005 Paris, France. Key-words: Tribosphenic mammals, Cretaceous, Middle Asia, Sharks, Environment. Mots-cles: Mammiferes tribospheniques, Cretace, Asie occidentale, Requins, Environnement. Palaeovertebrata, Montpellier, 23 0-4): 51-92, 3 fig., 9 pI. (Re~u le 12 F6vrier 1993, accept61e 17 Mars 1993. publi61e 20 Mai 1994) ABS1RACT This paper is an English concentrate of various Russian publications by the senior author presenting the mammaIian taxa from the Cretaceous (Albian through Santonian) of the region termed Middle Asia by Soviet geogmphers. -
AMERICAN MUSEUM NOVITATES Puhlished by Number 329 Thie AMERICAN Museum of NATURAL HISTORY Oct
AMERICAN MUSEUM NOVITATES Puhlished by Number 329 THiE AMERICAN MUsEUM OF NATURAL HISTORY Oct. 26, 1928 56.9 (117:51.7) FURTHER NOTES ON MONGOLIAN CRETACEOUS MAMMALS1 By GEORGE GAYLORD SIMPSON In 1923 the Third Asiatic Expedition discovered a mammal skull in the Cretaceous Djadokhta Formation of Mongolia-the second partial Mesozoic mammal skull ever to be described.2 Upon learning the importance of this specimen, which was still in the matrix and of doubtful relationships as it left them, the members of the expedition turned with renewed energy to searching for further material of the same sort. Their persistence was richly rewarded with no fewer than six additional partial skulls, as well as fragments indicating two other individuals. These specimens, found in 1925, were described the following year.3 Further collecting has been impossible, but in cleaning up the material already obtained from the Djadokhta an important new find was made. Imbedded and almost completely hidden in a sand- stone nodule collected in 1925 was a partial skull representing a new species of Zalambdalestes.. This skull shows the characters of the upper cheek teeth much more plainly than any of the earlier material and also is the first in which the complete posterior part of the mandi- ble, with the important angular region, is preserved. There are also asociated with the skull a broken femur and part of a pelvis- fragmentary but very welcome additional information. as to the struc- ture of this genus. Preparation of the first mammal discovered has also revealed some skeletal remains of Djadochtatherium which were not available at the time of the original description and which prove to be of considerable importance. -
The Earliest Known Eutherian Mammal
articles The earliest known eutherian mammal Qiang Ji*, Zhe-Xi Luo†, Chong-Xi Yuan*, John R. Wible†, Jian-Ping Zhang‡ & Justin A. Georgi† * Chinese Academy of Geological Sciences, Beijing 100037, China † Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, Pennsylvania 15213, USA ‡ Geoscience University of China, Beijing 100083, China ........................................................................................................................................................................................................................... The skeleton of a eutherian (placental) mammal has been discovered from the Lower Cretaceous Yixian Formation of northeastern China. We estimate its age to be about 125 million years (Myr), extending the date of the oldest eutherian records with skull and skeleton by about 40–50 Myr. Our analyses place the new fossil at the root of the eutherian tree and among the four other known Early Cretaceous eutherians, and suggest an earlier and greater diversification of stem eutherians that occurred well before the molecular estimate for the diversification of extant placental superorders (104–64 Myr). The new eutherian has limb and foot features that are known only from scansorial (climbing) and arboreal (tree-living) extant mammals, in contrast to the terrestrial or cursorial (running) features of other Cretaceous eutherians. This suggests that the earliest eutherian lineages developed different locomotory adaptations, facilitating their spread to diverse niches in the Cretaceous. Placental -
Jaw Shape and Mechanical Advantage Are Indicative of Diet in Mesozoic Mammals ✉ Nuria Melisa Morales-García 1 , Pamela G
ARTICLE https://doi.org/10.1038/s42003-021-01757-3 OPEN Jaw shape and mechanical advantage are indicative of diet in Mesozoic mammals ✉ Nuria Melisa Morales-García 1 , Pamela G. Gill1,2, Christine M. Janis 1,3 & Emily J. Rayfield 1 Jaw morphology is closely linked to both diet and biomechanical performance, and jaws are one of the most common Mesozoic mammal fossil elements. Knowledge of the dietary and functional diversity of early mammals informs on the ecological structure of palaeo- communities throughout the longest era of mammalian evolution: the Mesozoic. Here, we analyse how jaw shape and mechanical advantage of the masseter (MAM) and temporalis (MAT) muscles relate to diet in 70 extant and 45 extinct mammals spanning the Late 1234567890():,; Triassic-Late Cretaceous. In extant mammals, jaw shape discriminates well between dietary groups: insectivores have long jaws, carnivores intermediate to short jaws, and herbivores have short jaws. Insectivores have low MAM and MAT, carnivores have low MAM and high MAT, and herbivores have high MAM and MAT. These traits are also informative of diet among Mesozoic mammals (based on previous independent determinations of diet) and set the basis for future ecomorphological studies. 1 School of Earth Sciences, Wills Memorial Building, University of Bristol, Bristol, UK. 2 Department of Earth Sciences, Natural History Museum, London, UK. ✉ 3 Department of Ecology and Evolutionary Biology, Brown University, Providence, RI, USA. email: [email protected] COMMUNICATIONS BIOLOGY | (2021) 4:242 | https://doi.org/10.1038/s42003-021-01757-3 | www.nature.com/commsbio 1 ARTICLE COMMUNICATIONS BIOLOGY | https://doi.org/10.1038/s42003-021-01757-3 ur understanding of Mesozoic mammals has dramatically metric) has been used as a proxy for prey choice and feeding improved in the past three decades. -
New Protoceratopsid Specimens Improve the Age Correlation of the Upper Cretaceous Gobi Desert Strata
New protoceratopsid specimens improve the age correlation of the Upper Cretaceous Gobi Desert strata ŁUKASZ CZEPIŃSKI Czepiński, Ł. 2020. New protoceratopsid specimens improve the age correlation of the Upper Cretaceous Gobi Desert strata. Acta Palaeontologica Polonica 65 (X): xxx–xxx. New protoceratopsid (Dinosauria: Ceratopsia) specimens from two Late Cretaceous Mongolian localities with prob- lematic stratigraphy are described. A specimen of Protoceratops andrewsi from the Zamyn Khond locality enables its correlation with other sites of the Djadokhta Formation. P. andrewsi is also abundant in the Üüden Sair locality, variously assigned to the Djadokhta or Baruungoyot formations. However, one new specimen from that site exhibits a fused nasal horn and a sharp buccal crest of the dentary. With these apomorphic features, it resembles Bagaceratops rozhdestven- skyi, known from the Baruungoyot and Bayan Mandahu formations. It may be an evidence for: sympatric evolution of B. roz hdestvenskyi and P. andrewsi; a dispersal of Bagaceratops to Üüden Sair; hybridization between the two parapatric taxa; or the anagenetic evolutionary transition from P. andrewsi to Bagaceratops. The anagenetic explanation appears to be most strongly supported by given data. This new record advocates for the age of the sediments from the Üüden Sair locality being intermediate between the Djadokhta and Baruungoyot formations. The observed changes in the frequency of the apomorphic features within protoceratopsid samples from various Late Cretaceous sites of the Gobi Desert poten- tially enable their correlations and chronological ordering. Key words: Dinosauria, Ceratopsia, Protoceratopsidae, biostratigraphy, gradual evolution, anagenesis, Mesozoic, Mongolia. Łukasz Czepiński [[email protected], ORCID: https://orcid.org/0000-0002-8621-3888], Department of Palaeo- biology and Evolution, Faculty of Biology, Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland. -
CRANIODENTAL ANATOMY of a NEW LATE CRETACEOUS MULTITUBERCULATE MAMMAL from UDAN SAYR, MONGOLIA -.: Palaeontologia Polonica
CRANIODENTAL ANATOMY OF A NEW LATE CRETACEOUS MULTITUBERCULATE MAMMAL FROM UDAN SAYR, MONGOLIA GUILLERMO W. ROUGIER, AMIR S. SHETH,, BARTON K. SPURLIN, MINJIN BOLORTSETSEG, and MICHAEL J. NOVACEK Rougier, G.W., Sheth, A.S., Spurlin, B.K., Bolortsetseg, M., and Novacek M.J. 2016. Cra- nio dental anatomy of a new Late Cretaceous multituberculate mammal from Udan Sayr, Mongolia. Palaeontologia Polonica 67, 197–248. The multituberculate Mangasbaatar udanii gen. et sp. n., represented by two specimens from Udan Sayr locality in the Gobi desert (Mongolia), is a derived member of a speciose group of Late Cretaceous Mongolian multituberculates (LCMM), clustering together with large-size forms such as Catopsbaatar, Tombaatar, and Djadochtatherium, forming a monophyletic group. Tombaatar sabuli is the sister taxon and shares with the new form the dental formula, overall dental morphology, and approximate size. The new multituberculate has a very large middle ear cavity, housing a petrosal and promontorium that are deeply sunk into the brain- case. The expansion of the middle ear cavity seems to be absent among basal LCMM, only developing among members of Djadochtatherioidea, and to an extreme degree in the Udan Sayr multituberculate and Tombaatar. Among living mammals, enlarged middle ear cavities confer enhanced low frequency audition and are often found in fossorial species, such as golden moles, and several groups of rodents adapted to open, arid environments. Burrowing is a possible behavior for the new mammal and its closest relatives with similarly expanded middle ear regions and an arid environment has been proposed for the sediments where most LCMM are found. The new taxon further demonstrates the morphological, and possibly ecological, diversity among multituberculates. -
Wednesday Morning, November 3, 2004
WEDNESDAY MORNING, NOVEMBER 3, 2004 ROMER PRIZE SESSION PLAZA BALLROOM A/B MODERATORS: RYOSUKE MOTANI AND RAYMOND ROGERS 8:00 Welcome 8:15 Beck, A.: THE ORIGINS OF MAMMALIAN LOCOMOTION: NEW METHODS FOR RECONSTRUCTING POSURE IN EXTINCT NON-MAMMALIAN SYNAPSIDS BECK, Allison, Univ. of Chicago, Chicago, IL The Synapsida, composed of living mammals and their extinct ancestors, are colloquially known as the ‘mammal-like reptiles.’ The extensive fossil record captures numerous transitional forms recording the transition from Permian, reptile-like pelycosaurs to primitive therians of the Triassic. A major part of this transition involved a change from a sprawling posture to one similar to the crouched posture of living small mammals such as the opossum. Despite our understanding of the postural endpoints, the question remains: What was the locomotory posture of taxa that are phylogenetically intermediate between pelycosaurs and modern mammals? Two major notions of postural change have been proposed, both supported by functional morphologic analyses and comparison to living mammals and reptiles. One suggests that intermediate taxa were capable of a dual-gait, much like modern crocodilians. The other outlines a series of increasingly upright intermediates. Neither hypothesis has been quantitatively evaluated. Here I set up a framework for interpreting function in extinct vertebrates, and apply it to reconstructing posture in extinct non-mammalian synapsids. Linear and angular measurements were taken on the limb and girdle bones of extant iguanian and varanid lizards, crocodilians, therian mammals and monotremes, and again on fossil synapsids. Multivariate and bivariate analyses were used to correlate suites of morphologic features with posture in the living forms.